2r^2-8r-42
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There is a common GCF, 2. And since the leading coefficient 2 is positive, divide all terms by 2. So you would get 2(r^2-4r-21). Then you would get 2(r-7)(r+3)
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whats trinomials?
2(r^2-4r-21)
2(r-7)(r+3)
2(r^2-4r-21)
2(r-7)(r+3)
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2r^2-8r-42=2(r^2-4r-21)=
2(r-7)(r+3)
2(r-7)(r+3)
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2r^2 - 8r - 42
(2r + 6)(r - 7)
(2r + 6)(r - 7)
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(2r+6)(r-7)